My period is here but I feel pregnant

My period came a week late but I have sore boobs and tingly nipples during my period. I usually get sore boobs BEFORE my period during pms and my nipples have never had any type of feeling my whole entire life. I took a pregnancy test when I was 2 days late for my period and it was negative. I took another one today while I'm still on my period and it was still negative. But my boobs and nipples are super sore and I've been feeling kinda sick. I AM ALSO VERY CERTAIN THAT I AM NOT MISCARRYING. So wassup? And if I'm pregnant, why is the test still saying negative because if I'm pregnant then that means that I'm about 5 weeks.